From: "Christoph Lameter (Ampere)" <cl@gentwo.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Sweet Tea Dorminy <sweettea@google.com>,
Mateusz Guzik <mjguzik@gmail.com>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Dennis Zhou <dennis@kernel.org>, Tejun Heo <tj@kernel.org>,
Martin Liu <liumartin@google.com>,
David Rientjes <rientjes@google.com>,
christian.koenig@amd.com, Shakeel Butt <shakeel.butt@linux.dev>,
Johannes Weiner <hannes@cmpxchg.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R . Howlett" <Liam.Howlett@Oracle.com>,
Suren Baghdasaryan <surenb@google.com>,
Vlastimil Babka <vbabka@suse.cz>,
Christian Brauner <brauner@kernel.org>,
Wei Yang <richard.weiyang@gmail.com>,
David Hildenbrand <david@redhat.com>,
Miaohe Lin <linmiaohe@huawei.com>,
Al Viro <viro@zeniv.linux.org.uk>,
linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org,
Yu Zhao <yuzhao@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Matthew Wilcox <willy@infradead.org>
Subject: Re: [RFC PATCH v2] Introduce Hierarchical Per-CPU Counters
Date: Tue, 8 Apr 2025 13:44:25 -0700 (PDT) [thread overview]
Message-ID: <c013632c-b4ca-fb3d-9be5-b02ca5a3d859@gentwo.org> (raw)
In-Reply-To: <f014a9bb-0653-4682-8608-7fe6e2ad5ee6@efficios.com>
On Tue, 8 Apr 2025, Mathieu Desnoyers wrote:
> Currently percpu_counter_tree_precise_sum_unbiased() iterates on each
> possible cpu, which does not require cpu hotplug integration.
Well that looks like a performance issue if you have a system that can
expand to 8K cpus but currently only has 16 or so online.
next prev parent reply other threads:[~2025-04-08 21:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-08 16:05 Mathieu Desnoyers
2025-04-08 16:37 ` Christoph Lameter (Ampere)
2025-04-08 17:01 ` Matthew Wilcox
2025-04-08 17:41 ` Liam R. Howlett
2025-04-08 19:40 ` Mathieu Desnoyers
2025-04-08 20:08 ` Liam R. Howlett
2025-04-08 19:29 ` Mathieu Desnoyers
2025-04-08 20:44 ` Christoph Lameter (Ampere) [this message]
2025-04-08 21:00 ` Paul E. McKenney
2025-04-08 21:21 ` Christoph Lameter (Ampere)
2025-04-08 21:46 ` Paul E. McKenney
2025-04-08 22:12 ` Roman Gushchin
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